Oils can be harsh on the skin. If your product also has a solvent added to help with the application, you may need to wear gloves and eyewear. The biggest safety concern is ventilation. Fumes from the oil or varnish blend can cause severe respiratory issues and danger to your eyes and brain. If you can’t ventilate the area, you should consider an alternative to the product you’ve chosen.
Never leave oils around where children or pets can find them. Also, if you’re conditioning something in your food prep areas, make sure your oil is specifically labeled as food safe. Otherwise, you risk ingesting toxins.